My other number is even. My number is less than 300. Using 2,4,5

which "other" number?

That's part of the question. That's how the question is..

the questions posted here need to provide full context.

using those three digits, the only number which is even and less than 300 is

254

288

To find a number that is less than 300 and has an even sum when added to another number, you will need to choose the digits 2, 4, and 5 and arrange them in a way that satisfies the given conditions.

First, let's consider the conditions given:
1. Your other number is even.
2. Your number is less than 300.

To create a number less than 300, we need to select the hundreds digit, the tens digit, and the units digit from the given digits of 2, 4, and 5. However, since our other number needs to be even, the units digit must be an even number.

Let's try by placing the even digit, 4, in the units place. Now, we have two digits left, 2 and 5, to fill the hundreds and tens places. Since we want to create a number less than 300, we will place the largest remaining digit, 5, in the hundreds place and the remaining digit, 2, in the tens place.

By following this arrangement, we get the number 524, which satisfies the given conditions:
1. The other number is even (2).
2. The number is less than 300 (524 < 300).

Therefore, by using the digits 2, 4, and 5, the number that meets the given conditions is 524.